Computer well, badly processing

I bought this calculator, as it was a recommendation of the engineer school. Bin on the computing power enthusiastic. The calculator has a lot of functions that decrease a lot of work. For the calculator itself, there are 5 stars.

For processing but only 1 star. The entire housing is made of cheap plastic. The keys clatter and can be moved by 1 mm, which in Casio never been the case. Add to this that dissolve the labels to the keys as early as 6 months. Bin when the key will no longer be "readable" excited. Takes no longer determined long.